Gas-engine.



- PATENTED MAY 21, 1907. w. H. HOOPER & P. s. HUTGHINS.

GAS ENGINE. APPLICATION FILED APR. 2a, 905.

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W/ TWA-$352: //'v vs/v rows W William 'H. Hoop en I jd smmomns I by [W1 m To all whom it may concern:

' and FREDERICK S. Huronnvs, citizens ofthe which the following is a specification.

' ofthe type, and whichjshall obviate someof We have i ound in -prove d construction as allthe advantages of the four cycle type as to the complete and b d of any suitable character which is no ,1; wn in the drawing the shaft and crank bearings. I cylind er 4 is secured rigidly to the crank case,

connecting rod 'valve 5, aspecia opening being California, have invented certain new and provement are hereinafter described, and a practical embodiment as shown in: the drawzontalflsecti'on looking downward at the line Fig: 1: Figf' l is a Similar section Throu h the crank base 1, passes the en-. '1jg-i'neshat2 formed with or secured to the crank 3; The case is closed and is adapted their-meeting places to receive and guide the reciprocating slide valve 5.

UNITED- STATES PATENT OFFICE.

WILLIAM H. HOOPER AND FREDERICK S. HUTCHINS, OF SAN FRANCISCO,

" CAI JIFORNIA, SAID HUTCHINS ASSIGNOR TO SAID HOOPER.

GAS-ENGINE.

. No. 854,092. Specification of Letters Patent. Patented May 21, 1907.

Application filed April 28,1905. Serial no. 267.888.

Be it known that we, WILLIAM H. HOOPER United States, residing at San Francisco, In the county of. San Francisco and State ofv useful Improvements in Gas Engines, of

' Our invention relates 'to gas engines of the two cycle-type in which by a very cheap, light and simple construction we are able .to develop pro ortionately greater power than engines oft "s type heretofore used.

It is our object to provide a two-cycle en- X gine which shall possess all the advantages the disadvantages heretofore attaching to it.

ractice that our imperfect utilization of the .whole of the explosive charge, as well as to the perfect clear-- ance of the cylinderfrorn the explosive charge. Various features 'ofinvention and impart of the engine in section: Fig.3 is a'horilooking downward at the line z-z in Fig. 1. The engine is supported upon a base or to contain oil which is splashedfreely upon The engine and a diametricalguide way'is formed in This guide way is closedat'each end by an external plate 6. A hollow piston 7 reciprocates in the cylinder and the connectingrodfi is jointed to the piston and also to'the crank as shown. The asses through the ,slide fo'rnied in The slide valve is thus operated by the oscillation of the connecting rod. The lower end of the hollow .piston is closed by a slotted plate or partition 11, having guides for a or plate 13 is a spherical seat for a ball 14 freely through said ball; The lower end of the'piston is always closed, the slot, guide, sliding. plate and ball being employed to permit the free oscillation of the connecting rod. By this construction the space into which the gas is drawn, and which in engines of this type usuallyincludes the whole interior of the. piston, is 'much'reduced permitting the whole charge to be utilized.

v The cylinder has a space formed in its Wall, which is divided about midway by a partition 15. which separates said space into jacket, while the lower 17 is a gas space and a passage. The gas inlet is shown at 18 entering the space 17. The bottom of this s ace 17 is providedxwith openings 19 as shown in Fig. 4, and the crank case has a channel 21' which aiiords a communication into the cylinder below the piston. This communication is opened and closed at proper intervals by the slide valve 5, Fig. '1 showing it as .open. inder' is an opening 22 adjacent to whichis a valve seat for the gas outlet valve 24, whose stem is guided in a base 25, and which-is seated by a spring 26. The gas whichpasses at the upper endof Which is a spring-seated lift valve 28. The cylinder ha's'an ignition cates with the interior of the cylinder above the piston.

tension in which is formed the exhaust passage 32, and a seat 33 for the 'exhaust valve 34. The valve is a simplelift valve,

by a pressure spring .36. The lower end of the valve stem is connected toan arm 37 -working in a guide 38 and carrying a roller 39.

' On the engine shaft is an adjustable eccentrio 44 with Whose face the roller 39 is in contact. This .cam ca'nbe' adjusted by turning it upon the shaftso as to vary the exhaust said valve in which is universal y; seated, a. ball'9 through which the rod moves. freely.

and providejor high or low compression as may be desired. Fo'r'instan'ce, when the full surrounding the connecting rod which plays this valve is forcedup through a passage 27 space 29"above this valve, which communi The cylinder head is provided with an exe slide 12, in which, and-in an associated cap two, the upper 16 beingan ordinary water In the wallof the cyl-.-

whose stem 35, suitably guide-d, is encircled rob compression is not desired the exhaust is so arranged that a portion of the fresh charge is permitted to escape with the exploded charge of the previous compression.

The extension 30 of the water jacketed as shown at 42, and such extension is provided with an opening to permi-t the exhaust valve to be .set in position. Such opening isclosed in any suitable way, as by the screw plug 43 which is formed so as to permit the water to pass around it.

The sparking device comprises a jump sparker in the ignition space, controlled by contacts opened and. closed by the engine shaft. In the cylinder head is threaded a plate 45, in which is screwed the support 46 for the sparking plug 47, the latter passing through a gland 48. One igniting terminal extends through this plug, and the other, in close proximity is connected to the engine. In the electrical circuit are also the contacts 49, 51, of which one is carried by a stationary bracket 52 suitably to the engine shaft, while the'other, 51, is carried by a disk 53 which revolves with said shaft and causes the points 49 and 51 to make and break a contact at each revolution.

In describing the operation we shall commence by assuming that the piston is at the lower end of the cylinder, the crank at its lowest position, and the connecting rod vertical. The communication between the gas inlet and the lower part of the cylinder is closed because the slide valve 5 is covering the channel 21. As the piston rises as shown in Fig. 1 the slide valve opens this communication and gas is drawn into the space 17 and thence into the cylinder beneath the closed lower end of ton. On the return stroke the slide. valve closes the gas inlet-to thecylinder and the descending piston forces the explosive charge out of the cylinder throughthe valve 24 and the passage 27 into the ignition space, whence it extends into the upper part of the cylinder above the piston where it is exploded. The

return upstroke of the piston.

force of the explosion and the spring on the stem of the valve 28 holds the valve upon its seat until substantially the entire charge has escaped when the fresh charge forces open the'valve and enters the explosion chamber ready to be compressed and exploded on the In this manner a fresh charge is drawn in and compressed at every stroke of the engine instead of every other stroke, as with the ordinary four cycle engines. The .closing of the end of the piston reducesthe compression space, which in en-- 1 gines of this type, generally includes the cylinder head is supported in proximity closed at both the rising pis whole interior of the hollow piston; and We have found in practice that with such a closed piston the clearing of the compression space is complete at all speeds, which it is well known is not the case when the interior of the piston forms a part of such space. By using the universally jointed arrangement for the connecting rod, we not only provide an exceedingly simple and effective means for operating the slide valve 5, but also enable the said rod to be connected in the proper relation to a piston-having both ends closed.

While we have shown and described an engine of the vertical type, it must be understood that our improvements can be applied to horizontal engines as well.

We do not limit ourselves to the particular constructions and arrangements herein de.

scribed and shown in the accompanying drawings, as we desire to avail ourselves of such modifications and equivalents as fall properly within the spirit of our invention.

Havingthus fully described our invention, what we claim as new and Letters Patent is 1. In a gas engine the combination with the cylinder and with a piston closed at both ends, of the engine shaft and crank and a connecting rod passing through'one end of said piston and jointed to the other end.

' 2. In a gas engine, a cylinder, a hollow piston closed at both ends, a slot in the closure desire to secure by at one end, a slide for closing said slot anda I connecting rod passing through said slide and hinged directly to the'piston.

3. In a gas engine, a cylinder, a piston ends, a slot in the closure for one end, a slide covering said slot, a ball seated in said slide and a connecting rod passing through said ball and hinged to said piston.

4. In a gas engine a cylinder,having a hollow forming a gas space or passage provided with a gas inlet; a crank case secured with the cylinder, a guide way between the cylinder and crank case; a slide valve in said guide way; a channel in the crank case communicating with said gas passage and with said guide way and means for'operating the slide valve; whereby gas is drawn into the cylinder throughsaid gas inlet, gas passage, channel and guide way when said valve is open.

In testimony whereof we have affixed our signature, in presence of two witnesses, this fifteenth day of April 1905.

WILLIAM H.v HOOPER. "FRED. S. HUTCHINS. Witnesses:

L'. W;.SEELY, CELESTE ANsELL. 

